Can Mamata Banerjee become chief minister after losing Nandigram? Has it happened in past? Can Mamata Banerjee become chief minister after losing Nandigram? Has it happened in past? The Bengal election results left a dilemma involving political morality over this question: Can Mamata Banerjee remain chief minister after losing Nandigram? advertisement Mamata Banerjee This is unique and possibly the first time that a chief minister lost her seat, but the party registered a bigger victory than achieved in the previous assembly election. West Bengal Chief Minister Mamata Banerjee earned this distinction on May 2 as the results for West Bengal Assembly election were announced.